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Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 6945
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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2004 eclipse. replaced plugs. new tps. fuel dumping still.

Customer Question

2004 eclipse. replaced plugs. new tps. fuel dumping still.
Submitted: 1 year ago.
Category: Mitsubishi
Expert:  Doug replied 1 year ago.


Can you compression test the engine so we know what sort of cylinder health we are working with?

Customer: replied 1 year ago.
lets assume we have good compression
Expert:  Doug replied 1 year ago.

If we assume there is good compression, and that the ignition components are all in good shape now, then we have to consider our fuel control.

With regard to the TPS being replaced, did you try putting the old one back on and seeing if things at least improved to the previous condition (we have huge problems with aftermarket sensors on these cars causing issues)?
Can you pull the plugs again to see if one plug in particular is significantly wet (like one injector is leaking/operating erroneously)?

Customer: replied 1 year ago.
we replace the tps because it seemed to have a dead spot. all plugs are significantly wet. is it possible that a coolant sensor could make it run that rich?
Expert:  Doug replied 1 year ago.

Yes, it could... if it is reading colder than actual it will drastically over fuel.

I'm more stuck on the chain of events though... It was running but had a cylinder 5 misfire, then after the tune up and TPS within a day it won't run. While it is certainly possible the coolant sensor is failing (and easy enough to read it on a scan tool), my thoughts are more along the lines that the TPS is giving a bad signal or is misadjusted, as that would cause dramatic over fueling when cold started, enough so that it might make it impossible to get running again afterward without starting fluid or removing the plugs and cleaning/drying them.